File Repair Method and File Repair Device for User Equipment

1. A file repair device for a first user equipment (UE) configured to receive a target file multicasted by a network side in a file download transmission (FDT) manner, the device comprising: a receiving circuit configured to receive multicast attempt repair requests for the target file transmitted by UEs including the first UE, wherein the multicast attempt repair requests are received during a Back-off time for a current session; a decision circuit configured to perform statistics on the received multicast attempt repair requests for the target file to determine whether to perform multicast repair on the target file before a second time period expires, wherein the second time period is less than a time period of a Back-off time of a current session; and a transmitting circuit configured to transmit a feedback message to the UEs in a multicast area if it is determined to perform the multicast repair on the target file, wherein the feedback message instructs the first UE to perform the multicast repair on the target file, wherein the multicast attempt repair requests are received during a Back-off time for a current session.

2. The device of claim 1, wherein the second time period is a time period of an Offset time of the current session plus a preset time period.

3. The device of claim 1, wherein the multicast attempt repair requests carry an attempt flag bit to inquire the network side whether to perform the multicast repair on the target file.

4. The device of claim 1, wherein the feedback message carries a flag bit instructing the first UE to perform the multicast repair, the flag bit comprises a FDT update flag or a session description protocol (SDP) update flag, the FDT update flag instructs the UE to receive repair data of the target file multicasted by the network side based on the current session, and the SDP update flag instructs the UE to receive repair data of the target file multicasted by the network side in a new session.

5. The device of claim 1, wherein the transmitting circuit is further configured to: before the second time period expires, and if it is determined not to perform the multicast repair on the target file, transmit a first feedback message to the UEs in the multicast area, wherein the first feedback message instructs the UEs to wait for a multicast decision instruction from the network side.

6. The device of claim 1, wherein the multicast attempt repair requests further carry target file information lost by the UEs, and the decision circuit comprises: a statistical circuit configured to perform statistics on the target file information in the received multicast attempt repair requests to generate a statistics result if it is determined to perform the multicast repair on the target file, before the second time period expires; and a determining circuit configured to determine multicast repair information based on the statistics result.

7. The device of claim 6, wherein the determining circuit is further configured to: determine range information of all symbols lost by the UEs that transmit the multicast attempt repair requests in a current request time period as the multicast repair information; or determine range information of a predetermined ratio of all symbols lost by the UEs that transmit the multicast attempt repair requests in the current request time period as the multicast repair information.

8. The device of claim 1, wherein the determining circuit is configured to determine whether to perform multicast repair on the target file through a machine learning multi-classification model.

9. A file repair device for a first user equipment (UE) configured to receive a target file multicasted by a network side in a file download transmission (FDT) manner, the device a memory storing computer-readable instructions; and at least one processor coupled to the memory and configured to execute the computer-readable instructions to receive multicast attempt repair requests for the target file transmitted by UEs including the first UE, wherein the multicast attempt repair requests are received during a Back-off time for a current session, determine whether to perform multicast repair on the target file through a machine learning multi-classification model before a second time period expires, wherein the second time period is less than a time period of a Back-off time of a current session; and transmit a feedback message to the UEs in a multicast area if it is determined to perform the multicast repair on the target file, wherein the feedback message instructs the first UE to perform the multicast repair on the target file, wherein the multicast attempt repair requests are received during a Back-off time for a current session.

10. The device of claim 9, wherein the second time period is a time period of an Offset time of the current session plus a preset time period.

11. The device of claim 9, wherein the multicast attempt repair requests carry an attempt flag bit to inquire the network side whether to perform the multicast repair on the target file.

12. The device of claim 9, wherein the feedback message carries a flag bit instructing the first UE to perform the multicast repair, the flag bit comprises a FDT update flag or a session description protocol (SDP) update flag, the FDT update flag instructs the UE to receive repair data of the target file multicasted by the network side based on the current session, and the SDP update flag instructs the UE to receive repair data of the target file multicasted by the network side in a new session.

13. The device of claim 9, wherein the at least one processor is configured to execute the computer-readable instructions to: before the second time period expires, and if it is determined not to perform the multicast repair on the target file, transmit a first feedback message to the UEs in the multicast area, wherein the first feedback message instructs the UEs to wait for a multicast decision instruction from the network side.

14. The device of claim 9, wherein the multicast attempt repair requests further carry target file information lost by the UEs, and the at least one processor is configured to execute the computer-readable instructions to: perform statistics on the target file information in the received multicast attempt repair requests to generate a statistics result if it is determined to perform the multicast repair on the target file through a machine learning multi-classification model, before the second time period expires.

15. The device of claim 14, the at least one processor is configured to execute the computer-readable instructions to: determine multicast repair information based on the statistics result through a machine learning multi-classification model.

16. The device of claim 15, wherein the at least one processor is configured to execute the computer-readable instructions to: determine range information of all symbols lost by the UEs that transmit the multicast attempt repair requests in a current request time period as the multicast repair information; or determine range information of a predetermined ratio of all symbols lost by the UEs that transmit the multicast attempt repair requests in the current request time period as the multicast repair information.

17. A file repair method for a first user equipment (UE) configured to receive a target file multicasted by a network side in a file download transmission (FDT) manner, the method comprising: receiving, by the network side, multicast attempt repair requests for the target file transmitted by UEs including the first UE, wherein the multicast attempt repair requests are received during a Back-off time for a current session; determining, by the network side, whether to perform multicast repair on the target file through a machine learning multi-classification model before a second time period expires; and transmitting, by the network side, a feedback message to the UEs in a multicast area if it is determined to perform the multicast repair on the target file, wherein the feedback message instructs the first UE to perform the multicast repair on the target file and is transmitted during the Back-off time for the current session.

18. The method of claim 17, wherein the second time period is a time period of an Offset time of the current session plus a preset time period.

19. The method of claim 17, wherein the multicast attempt repair requests carry an attempt flag bit to inquire the network side whether to perform the multicast repair on the target file.

20. The method of claim 17, wherein the feedback message carries a flag bit to instruct the first UE to perform the multicast repair, the flag bit comprises a FDT update flag or a session description protocol (SDP) update flag, the FDT update flag instructs the first UE to receive repair data of the target file multicasted by the network side based on the current session, and the SDP update flag instructs the first UE to receive repair data of the target file multicasted by the network side in a new session.